You generally are not allowed to carry lithium batteries in checked baggage. So your phone's lithium battery is not a problem as long as it's in your pocket.
This is absolutely not true – guidelines from e.g. FAA and IATA are extremely clear that devices are permitted in both checked and carry-on baggage. There are some restrictions around bare cells, e-cigarettes etc. but for the most part these devices are no problem.
This is absolutely not true – guidelines from e.g. FAA and IATA are extremely clear that devices are permitted in both checked and carry-on baggage. There are some restrictions around bare cells, e-cigarettes etc. but for the most part these devices are no problem.